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<html> <head><title>Power spectrum of inter-event intervals</title></head><body bgcolor="#ffffff"><h3>Power spectrum of inter-event intervals</h3><font color=blue><tt>spikespec [-F# -## -w# -i -o </tt><em>outfile</em><tt> -l# -x# -c# -V# -h] </tt><em> file(s)</em></font><blockquote>   <br>     <font color=blue><tt> -F  </tt></font>maximal frequency (2*l / total time)   <br>     <font color=blue><tt> -#  </tt></font>number of frequencies (F* total time /2)   <br>     <font color=blue><tt> -w  </tt></font>frequency resolution (0)   <br>     <font color=blue><tt> -i  </tt></font>expect intervals rather than times   <br>     <font color=blue><tt> -l  </tt></font>number of values to be read (all)   <br>     <font color=blue><tt> -x  </tt></font>number of values to be skipped (0)   <br>     <font color=blue><tt> -c  </tt></font><a href=../general.html#column>column to be read</a> (1 or <font color=blue><em>file</em></font>,#)   <br>     <font color=blue><tt> -o  </tt></font><a href=../general.html#outfile>output file name</a>, just <font color=blue><tt> -o  </tt></font>means <font color=blue><em>file</em></font><font color=blue><tt>_sp</tt></font>   <br>     <font color=blue><tt> -V  </tt></font><a href=../general.html#verbosity>verbosity level</a> (0 = only fatal errors)   <br>     <font color=blue><tt> -h  </tt></font>show this message</blockquote>Computes a power spectrum assuming that the data are the times of singularevents, e.g. heart beats. With the flag <font color=blue><tt> -i</tt></font>set, the data is taken to be inter-event intervals rather than event times.If the event times are t(n), n=1,...,l, the spectrum is defined by<pre>            l                    2         | --- 	                |         | \     -i 2 pi f t(n) |  S(f) = |  |  e	        |   	 | /   	                |         | --- 	                |           n=1 	    </pre>that is, the signal is taken to be a sum of delta functions at the t(n).S(f) is computed for <font color=blue><tt>#</tt></font> frequencies between 0 and <font color=blue><tt> -F </tt></font>. The result is binned down to afrequency resolution <font color=blue><tt> -w </tt></font>. Output file <em>file</em>_ss (frequency, spectrum).<hr><a href="../contents.html">Table of Contents</a> * <a href="../../index.html" target="_top">TISEAN home</a></body></html>
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